.header {
  position: fixed; /* 固定定位 */
  top: 0; /* 固定在顶部 */
  left: 0; /* 左对齐 */
  right: 0; /* 右对齐，确保宽度撑满 */
  z-index: 1000; /* 确保头部始终显示在其他内容上方 */
  background-color: #c62828;
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: white;
}

.logo {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo img {
  height: 40px;
}

.header h1 {
  font-size: 35px;
  margin: 0;
  font-weight: bold;
  font-family: '黑体';
  margin-left: 100px;
  min-width: 280px;
  text-shadow: 1px 3px 2px rgba(0, 0, 0, 0.621);
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}